1. What is the mass of 1 mole of Uranium?

2. g

3. What is the molar mass of Magnesium chloride (MgCl2)?

4. g/mole

5. What is the molar mass of (NH4)2CO3?

6. g/mole

7. How many atoms are in 52.5 grams of CaI2?

8. 1.08 x 1023 atoms CaI2

9. How many moles are in 86.4 grams of CO2?

10. 1.96 mole CO2

11. How many atoms are in 2.35 moles of CuSO4?

12. 1.42 x 1024 atoms CuSO4

13. What is the percent by mass of Sodium in Na2S?

14. 58.91 % Sodium

15. What is the percent of Nitrogen in Ba(NO3)2?

16. 10.72 % Nitrogen

17. What is the percentage by mass of Chlorine in KClO3?

18. 28.93 % Chlorine

19. Write the molecular and empirical formula for the above compound

20. C4H4 CH

21. What is the empirical formula of the compound whose molecular formula is P4O8?

22. PO2

23. Write the molecular and empirical formula

24. C4H10 C2H5

25. Write 2 possible molecular formulas for CH4O

26. C2H8O2 C3H12O3

27. Which formulas are empirical CH2 N5O10 H2O3

28. CH2 H2O3

29. Rubbing alcohol is said to contain 60% C, 13.4% Hydrogen and 26.6 % O. What is the empirical formula?

30. C3H8O

31. A compound was found to contain 47. 0 g of K, 14. 5 g of C, and 38
A compound was found to contain 47.0 g of K, 14.5 g of C, and 38.5 g of O. Calculate the empirical formula.

32. KCO2

33. A sample of an unknown compound contains 65. 5 grams of Carbon, 5
A sample of an unknown compound contains 65.5 grams of Carbon, 5.5 grams of Hydrogen, and 29.0 grams of Oxygen. Calculate the empirical formula.

34. C3H3O

35. How many atoms are in 1 mole of NH4NO3?

36. 6.022 x 1023

37. Comparing a mole of Copper and a mole of Silver shows that which sample has more atoms.

38. They have the same amount of atoms.

39. How many moles in 185 grams of Ba(OH)2?

40. 1.08 mole Ba(OH)2

41. Convert 0.560 moles of CO to grams.

42. 15.7 g CO

43. How many grams of C2H4 will have 4.35 x 1024 atoms?

44. 203 grams C2H4